Device and method for preparing benzaldehyde by using impinging stream rotating packed bed

A technology of rotating packed bed and impinging flow, which is applied in the direction of feeding device, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of low quality benzaldehyde products, few by-products, harsh reaction conditions, etc., and achieve microscopic Effects of enhanced mixing and mass transfer process, faster reaction rate, and easier operation

Active Publication Date: 2019-07-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of severe reaction conditions, many synthesis steps, low yield, high energy consumption cost and low quality of benzaldehyde products in the prior synthesis of benzaldehyde compounds, the present invention provides an impinging flow rotating packed bed for preparing benzene A device and method for formaldehyde, the preparation method does not require a catalyst, and has the advantages of simple process, high yield and few by-products

Method used

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  • Device and method for preparing benzaldehyde by using impinging stream rotating packed bed
  • Device and method for preparing benzaldehyde by using impinging stream rotating packed bed
  • Device and method for preparing benzaldehyde by using impinging stream rotating packed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 5.41 g (0.05 mol) benzyl alcohol and dissolve it in 500 mL ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.05 mol) to 500 mL and place it in the liquid storage tank III, set the rotational speed of the rotating packed bed to 300 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packing bed again, and the reaction liquid was passed into the liquid storage tank II, and ...

Embodiment 2

[0026] Add 5.41 g (0.05 mol) benzyl alcohol and dissolve it in 500 mL ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.15 mol) to 500 mL and place it in the liquid storage tank III, set the rotating packing bed speed to 500 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packing bed again, and the reaction liquid was passed into the liquid storage tank II, and the reaction liqu...

Embodiment 3

[0029]Add 5.41 g (0.05 mol) of benzyl alcohol and dissolve it in 500 mL of ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.25 mol) to 500 mL and place it in the liquid storage tank III, set the rotating packing bed speed to 800 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packed bed again, and the reaction liquid was passed into the liquid storage tank II, and the reaction ...

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Abstract

The invention discloses a device and method for preparing benzaldehyde by using an impinging stream rotating packed bed, belongs to the technical field of fine chemical engineering, and can solve theproblems that in existing synthesis of benzaldehyde compounds, reaction conditions are harsh, synthetic steps, the yield is low, the energy consumption cost is higher, and the quality of benzaldehydeproducts is not high. The device comprises the impinging stream rotating packed bed, a liquid storage tank I, a liquid storage tank II provided with a stirring rod, and a liquid storage tank III. Theimpinging stream rotating packed bed is used for violently shearing and crushing fluid to generate a huge and quickly updated phase interface, so that the microscopic mixing and mass transfer processis greatly enhanced, the reaction rate is increased, and the method has the advantages of simplicity in operation, high yield, mild reaction conditions, easiness for industrialization and the like.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a device and a method for preparing benzaldehyde in an impinging flow rotating packed bed. Background technique [0002] Benzaldehyde compounds are important organic synthesis intermediates and fine chemical products, widely used in medicine, dyes, spices, resins and other industries. At present, the methods for synthesizing benzaldehyde compounds mainly include benzyl chloride hydrolysis method and toluene liquid-phase air oxidation method. These two methods have disadvantages such as harsh reaction conditions, low yield, and many by-products. [0003] There are many deficiencies in the traditional method for synthesizing benzaldehyde. In recent years, many scholars have reported the research on the synthesis of benzaldehyde by oxidation of benzyl alcohol. This method has the advantages of simple process, environmental friendliness, good quality of benzaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18B01J19/00B01J4/02B01J4/00C07C45/30C07C47/54
CPCB01J4/002B01J4/02B01J19/0006B01J19/0053B01J19/18C07C45/30C07C47/54
Inventor 刘有智焦纬洲高文强李鹏阳
Owner ZHONGBEI UNIV
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